Telephone



(No Model.) 7 2 Sheets-Sheet 1. s. A. DINS1VIORE.

- V TELEPHONE. 7 NO. 553,843. Patented Feb. 4, 1896.

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(No Model.) 2 Sheets-Sheet 2.

S. A. DINSMORE. TELEPHONE.

No. 553,843. Patented Feb. 4, 1896.

UNITED STAT S PATENT OFFICE.

SAMUEL ARTHUR DINSMORE, OF CHICAGO, ILLINOIS.

TELEPHONE.

SPECIFICATION forming part of Letters Patent No. 553,843, dated February4, 1896. Application filedMarch 8,1895- Serial No. 540,973. (No model.)

To all whom it may concern.-

Be it known that I, SAMUEL ARTHUR DINS- MORE, a citizen of the UnitedStates, residing at Chicago, in the county of Cook and State ofIllinois, have invented certain Improvements in Telephone Devices, ofwhich the following is a specification.

My invention relates to telephones, and has for its object to provideautomatic means for preventing the granulated carbon of the transmitterfrom packing or otherwise getting into a condition where its efliciencyis impaired. This object I accomplish by the means hereinafter referredto, and which consist essentially and broadly considered of deviceswhereby when the telephone is brought into use, or particularly when thetelephone is operated so as to gii e the call-signal to the instrumentat the other end of the line, the granulated carbon will necessarily,but automatically, be moved, disturbed, or shaken up so as to preventits packing and to avoid the impairment of its efficiency.

It will be observed that my invention can be readily applied to allkinds of telephones where granulated carbon is employed in thetransmitter, and it will be equally evident that as to the mere devicesemployed they may be quite readily altered without departing from thespirit of my invention.

I have illustrated a particular form of my invention which consists ofcertain devices operated by means of the crank by which the signal-bellis set in operation in a large class of the ordinary telephones. I havealso in a more general way indicated diagrammatically the application ofmy invention to a case where the crank is not used, and where thegranulated carbon is shaken up from either end of the line in theordinary process of giving the call.

I will now describe in detail the particular form of my invention whichI have illustrated.

Figure 1 is a front elevation with parts broken away. Fig. 2 is asimilar side elevation. Fig. 3 is a diagrammatic illustration of thecircuits of the devices of Figs. 1 and 2. Fig. 4 is a diagrammatic viewof a telephone in which the call is given by a battery and switch ratherthan-by a magneto-generator and crank.

Like parts are indicated by the same letter in all the figures.

A is the receiver.

B is the case which contains the transmitting mechanism.

C is the call-bell; D, the magnets which operate it.

E is the magneto-generator; F, the crank for operating the same.Associated with this crankis the gear G adapted to mesh with the pinionH whereby the magneto-generator is driven.

The gear G has a pin J projecting into a position whereby in the courseof its excursion it engages the arm K of the lever which is pivoted at Kand provided with the arm K and the retracting-springK The arm K engagesthe teeth of the ratchet-wheel L, which ratchet-wheel is engaged by thedog M. This ratchet-wheel is made part of a ring N which contains theinsulated cup N, which cup contains the granular carbon and thediaphragm N There may also be a carbon block or rosette. In short thearrangement and character of the contents of the cup or thepeculiarities of the transmitter are no part of my invention, so long asthe transmitter contains as an element thereof the granular carbon whichis to be prevented from packing.

' O is the mouthpiece; O, a thimble or tube at the base of themouthpiece and forming the lining for the aperture back of themouthpiece.

0 is an outwardly-projecting tubular portion rigid on the ratchet-wheelL and resting within the thimble, which serves as a bearing therefor.The ratchet-wheel L is held in position by the lugs 0 0 The circuits maybe traced in Fig. 3. P is one binding-post, whence leads the conductor Pto the hook P on which the receiver A hangs. This hook is in contactwith the terminal P when the receiver is hanging on the hook, and fromthe terminal leads the con ductor P to the magneto-generator, whenceleads the conductor P through the magnets D D to the bindin g-post orterminal P IVhen the receiver A is removed from its hook the latterrises into contact'with the two terminals R and R,'and the circuitestablished may be traced as follows: from R the battery, by conductorltthrough the primary of the induction-coil R thence by the conductor R tothe terminal R, along the hook P to the terminal R, by conductor R tothe terminal R which engages the contact R of the transmitter, andthence through the transmitter and the granular carbon thereof to theratchet-wheel L, thence to the terminal R", thence by conductor It tothe battery.

The secondary or talking circuit, which is established when the hook israised and the machinery freed therefrom, may be traced as follows: frombinding post I along conductor P, along the hook P to terminal R, thenceon the conductors S through the receiver to the secondary coil of theinductioncoil R thence by conductor S to conductor P, and thence to thebinding-post P Referring now to Fig. 4:, I will describe the circuits ofa device or arrangement wherein my invention is illustrated underdifierent conditions.

T is a binding-post whence leads the conductor T to the hook T on whichthe receiver T is supported. The hook engages when down the terminal Twhence leads the cond uctor T to the magnets T, whence leads theconductor T to the switch T whence leads the conductor T to thecall-bell C, and thence to the conductor T and to the binding-post T.Now the magnet T has exposed to it one end of the lever T, which thusserves as an armature. This lever is pivoted at T and one end isassociated with the retractingspring T and the other en (1 with the dogT to drive the ratchet-wheel L. The talkingcireuit and the primary orbattery circuit in this diagram are or may be practically the same asthe like circuits in diagram Fig. If now the telephone of diagram Fig.4; be provided with the switch T and battery for giving the signal-call,instead of the crank and magneto-generator, the circuit will be asfollows: Proceeding from T to T ,'as above described, we assume that theswitch is in the position shown in dotted lines, whence the circuit iscontinued from switch T by conductor U through battery U, by conductor Uto conductor T to terminal T Instead of the switch T I may place acontact in the path of the receiver-hook so that a circuit will bemomentarily completed by the movement of said hook, due to the rem ovaland replacement of the receiver. In indicating this construction in Fig.4., for convenience I have shown the signal of the person to be calledand the magnet that moves the receiver as connected in multiple.

IVhen the lever T comes in contact with the contact V the circuits aretraced as follows: from battery U to wire U where it divides, part goingout on the line to the instrument of the person called through theirsignaling apparatus, thence back to T, then by wire T, contactV, andwire V to the battery. The other portion goes by wire V through magnetT", thence by wires T V, contact V, lever T and wire V back to thebattery.

It is evident that I may obtain the desired result in many differentways, and I therefore do not wish to be limited by the arrangementherein shown and described.

The use and operation of my invention are as follows:

Referring to that particular form of the invention illustrated in Figs.1., 2 and 3, it is plain that when the crank is operated to drive themagneto-generator and thus sound the bell at the instrument of theperson sought to be called, the gear-wheel G will rotate, and by theengagement of the pin J with the arm K of the lever will rotate theratchet-wheel L or move it a short distance an d thus turn thetransmitter on its bearing and cause the granulated carbon therein toshake about and the particles to move their relative positions.

In Fig. 4 the means for thus shaking the transmitter are shown to beelectrically operated. \Vhen the call is to be given to the person withwhom communication is desired, the switch T may be operated so as to putthe battery U in circuit with the bell or other calling device of theperson to be called. At the same time the battery U is brought incircuit with the magnets T", so that as the call bell is rung themagnets are energized and the ratchet-wheel with its associated transmitter is rotated by means of the lever. These are some of the means bywhich the transmitter may be so agitated.

I claim- 1. In a telephone having a transmitter c011- taining granulatedcarbon, the combination of means for agitating such carbon with meansfor giving the call-signal to the telephone with which communication issought, and connections between them whereby the agitating mechanism isresponsive to the callsignaling mechanism.

2. The combination in a telephone having a transmitter containinggranulated carbon of a call-circuitoperating device provided with aprojection, a pivoted lever having one end in such a position as to beengaged by said projecting part when the call-circuit-opcrating deviceis moved, the other end of said lever being connected with thetransmitter whereby said transmitter is moved by the movement of thecall-circuit-operating device.

3. In a telephone containing a transmitter consisting in part ofgranulated carbon, the combination of a carbon-agitating mechanism witha call-bell-operatin g mechanism containing a magnetogenerator andconnections from such call-bell-operating mechanism to thecarbon-agitatin g mechanism, so that when the former is operated thelatter is set in motion.

Signed at Chicago, Illinois, March 5, A. D. 1895.

SAMUEL ARTHUR DINSMORE.

In presence of- J OHN II. OoULTER, FRANCIS M. IRELAND.

